further reduce CPU usage

scripts/_7zip.py

@@ -47,20 +47,12 @@ def extract_iso(src, dst, pattern=None, suppress_out=True):
     if pattern is None:
         _cmd = _7zip + cli_option + ' x -y -o' + gen.quote(dst) + ' ' + gen.quote(src) + suppress_out
     else:
-        _cmd = _7zip + ' -y x ' + gen.quote(src) + ' -o' + dst + ' ' + gen.quote(pattern) + ' -r' + suppress_out
+        _cmd = _7zip + ' x -y ' + gen.quote(src) + ' -o' + dst + ' ' + gen.quote(pattern) + ' -r' + suppress_out
     gen.log('Executing ==> ' + _cmd)
-    _7zip_process = subprocess.Popen(_cmd, universal_newlines=True, stdin=subprocess.PIPE, stderr=subprocess.PIPE,
-                                     stdout=subprocess.PIPE, shell=True)
+
     config.status_text = 'Status: Extracting ' + os.path.basename(src).strip()
-    while True:
-        line = _7zip_process.stdout.readline()
-        # gen.log(line)
-        if line.startswith('- '):
-            config.status_text = 'Status: Extracting ' + line[2:].strip()
-        elif platform.system() == 'Linux': # line.startswith('Extracting'):  # Under Linux it prints directly all the process (may be due to version diff).
-            config.status_text = 'Status: ' + line.strip()
-        if line == '' and _7zip_process.poll() != None:
-            break
+    with open(os.devnull, 'w') as devnull:
+        subprocess.call(_cmd, stdin=devnull, stdout=devnull, stderr=devnull, shell=True)
 
 
 def list_iso(iso_link, suppress_out=True):

scripts/imager.py

@@ -48,10 +48,11 @@ def dd_linux():
     ).start()
 
     while dd_process.poll() is None:
-        time.sleep(1)  # If this time delay is not given, the Popen does not execute the actual command
+        time.sleep(0.1)  # If this time delay is not given, the Popen does not execute the actual command
         dd_process.send_signal(signal.SIGUSR1)
         dd_process.stderr.flush()
         while True:
+            time.sleep(0.1)
             out_error = dd_process.stderr.readline().decode()
             if out_error:
                 if 'bytes' in out_error:

scripts/install.py

@@ -12,6 +12,7 @@ import sys
 import platform
 import threading
 import subprocess
+import time
 from .usb import *
 from .gen import *
 # from .iso import *
@@ -146,6 +147,7 @@ def install_progress():
             percentage = 100
         config.percentage = percentage
         pbar.update(percentage)
+        time.sleep(0.1)
 
 
 def install_patch():